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  • Unable to integrate ffmpeg as a native dependency for an Android NDK project

    28 février 2019, par mmark

    I have an Android NDK project which consists entirely of C/C++ code, and it basically processes images without using any external libraries.

    I’m using Android Studio + Gradle NDK Experimental plugin (0.7.0-alpha1).

    Now, I need to integrate ffmpeg as a native library to use it from the C/C++ code in order to decode a H.264 video frame.

    These are the questions I’ve found here regarding this issue :

    Android - Integrating ffmpeg and android-ndk-r9c

    Android NDK w/ ffmpeg library - error running project

    Using FFmpeg native libraries with Android-NDK

    Can not build with prebuilt static libraries using gradle-experimental

    Here is my build.gradle file :

    apply plugin: 'com.android.model.application'
    

    
def ffmpeg_path = file(project(':ffmpeg').projectDir).absolutePath + "/ffmpeg-android"
    

    
model {
    

    
    repositories {
    
        libs(PrebuiltLibraries) {
    
            libavcodec {
    
                headers.srcDir "${ffmpeg_path}/include"
    
                binaries.withType(StaticLibraryBinary) {
    
                    staticLibraryFile = file("${ffmpeg_path}/${targetPlatform.getName()}/lib/libavcodec.a")
    
                }
    
            }
    
            libavutil {
    
                headers.srcDir "${ffmpeg_path}/include"
    
                binaries.withType(StaticLibraryBinary) {
    
                    staticLibraryFile = file("${ffmpeg_path}/${targetPlatform.getName()}/lib/libavutil.a")
    
                }
    
            }
    
            libswresample {
    
                headers.srcDir "${ffmpeg_path}/include"
    
                binaries.withType(StaticLibraryBinary) {
    
                    staticLibraryFile = file("${ffmpeg_path}/${targetPlatform.getName()}/lib/libswresample.a")
    
                }
    
            }
    
            libswscale {
    
                headers.srcDir "${ffmpeg_path}/include"
    
                binaries.withType(StaticLibraryBinary) {
    
                    staticLibraryFile = file("${ffmpeg_path}/${targetPlatform.getName()}/lib/libswscale.a")
    
                }
    
            }
    
            libavformat {
    
                headers.srcDir "${ffmpeg_path}/include"
    
                binaries.withType(StaticLibraryBinary) {
    
                    staticLibraryFile = file("${ffmpeg_path}/${targetPlatform.getName()}/lib/libavformat.a")
    
                }
    
            }
    
            libavdevice {
    
                headers.srcDir "${ffmpeg_path}/include"
    
                binaries.withType(StaticLibraryBinary) {
    
                    staticLibraryFile = file("${ffmpeg_path}/${targetPlatform.getName()}/lib/libavdevice.a")
    
                }
    
            }
    
            libavfilter {
    
                headers.srcDir "${ffmpeg_path}/include"
    
                binaries.withType(StaticLibraryBinary) {
    
                    staticLibraryFile = file("${ffmpeg_path}/${targetPlatform.getName()}/lib/libavfilter.a")
    
                }
    
            }
    
            libpostproc {
    
                headers.srcDir "${ffmpeg_path}/include"
    
                binaries.withType(StaticLibraryBinary) {
    
                    staticLibraryFile = file("${ffmpeg_path}/${targetPlatform.getName()}/lib/libpostproc.a")
    
                }
    
            }
    
        }
    
    }
    

    
    android {
    
        compileSdkVersion = 23
    
        buildToolsVersion = "23.0.2"
    

    
        defaultConfig.with {
    
            applicationId = "com.example.hellojni"
    
            minSdkVersion.apiLevel = 4
    
            targetSdkVersion.apiLevel = 23
    
        }
    
    }
    

    
    /*
    
     * native build settings
    
     */
    
    android.ndk {
    
        moduleName = "hello-jni"
    
        platformVersion = 9 //same as minSdkVersion.apiLevel for better compatibility
    
        stl    = "c++_static"
    
        abiFilters.addAll(["armeabi", "armeabi-v7a", "x86"]) //filtering ABIs on the ones Google Play Games library is compatible with.
    
    }
    
    android.buildTypes {
    
        release {
    
            minifyEnabled = false
    
            proguardFiles.add(file('proguard-rules.txt'))
    
        }
    
    }
    

    
    android.sources {
    
        main {
    
            jni {
    
                dependencies {
    
                    library "libavcodec" linkage "static"
    
                    library "libavutil" linkage "static"
    
                    library "libswresample" linkage "static"
    
                    library "libswscale" linkage "static"
    
                    library "libavformat" linkage "static"
    
                    library "libavdevice" linkage "static"
    
                    library "libavfilter" linkage "static"
    
                    library "libpostproc" linkage "static"
    
                }
    
            }
    
        }
    
    }
    

    
}

    I based on this sample from Google which integrates an external native library.

    This is the ffmpeg project I compiled before importing it into mine :
    https://github.com/WritingMinds/ffmpeg-android

    I’ve added all the .a and .h files and I’m able to import the headers in my C/C++ code, but when I try to compile it I get the following error :

    /Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(utils.o):utils.c:function try_decode_frame: error: undefined reference to 'avpriv_h264_has_num_reorder_frames'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(utils.o):utils.c:function compute_pkt_fields: error: undefined reference to 'avpriv_h264_has_num_reorder_frames'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(utils.o):utils.c:function parse_packet: error: undefined reference to 'av_parser_parse2'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(utils.o):utils.c:function parse_packet: error: undefined reference to 'av_parser_close'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(utils.o):utils.c:function read_frame_internal: error: undefined reference to 'av_parser_init'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(utils.o):utils.c:function avformat_find_stream_info: error: undefined reference to 'av_parser_init'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(utils.o):utils.c:function avformat_find_stream_info: error: undefined reference to 'avcodec_pix_fmt_to_codec_tag'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(utils.o):utils.c:function avformat_find_stream_info: error: undefined reference to 'avpriv_get_raw_pix_fmt_tags'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(utils.o):utils.c:function ff_stream_add_bitstream_filter: error: undefined reference to 'av_bitstream_filter_init'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(utils.o):utils.c:function ff_stream_add_bitstream_filter: error: undefined reference to 'av_bitstream_filter_close'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(utils.o):utils.c:function av_apply_bitstream_filters: error: undefined reference to 'av_bitstream_filter_filter'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(aadec.o):aadec.c:function aa_read_packet: error: undefined reference to 'av_tea_init'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(aadec.o):aadec.c:function aa_read_packet: error: undefined reference to 'av_tea_crypt'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(aadec.o):aadec.c:function aa_read_header: error: undefined reference to 'av_tea_alloc'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(aadec.o):aadec.c:function aa_read_header: error: undefined reference to 'av_tea_init'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(aadec.o):aadec.c:function aa_read_header: error: undefined reference to 'av_tea_crypt'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(ac3dec.o):ac3dec.c:function ac3_eac3_probe.isra.0: error: undefined reference to 'avpriv_ac3_parse_header'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(adtsenc.o):adtsenc.c:function adts_write_header: error: undefined reference to 'avpriv_mpeg4audio_get_config'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(adtsenc.o):adtsenc.c:function adts_write_header: error: undefined reference to 'avpriv_copy_pce_data'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(asfcrypt.o):asfcrypt.c:function ff_asfcrypt_dec: error: undefined reference to 'av_rc4_alloc'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(asfcrypt.o):asfcrypt.c:function ff_asfcrypt_dec: error: undefined reference to 'av_rc4_init'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(asfcrypt.o):asfcrypt.c:function ff_asfcrypt_dec: error: undefined reference to 'av_rc4_crypt'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(asfcrypt.o):asfcrypt.c:function ff_asfcrypt_dec: error: undefined reference to 'av_rc4_init'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(asfcrypt.o):asfcrypt.c:function ff_asfcrypt_dec: error: undefined reference to 'av_rc4_crypt'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(matroska.o):matroska.c:function ff_mkv_stereo3d_conv: error: undefined reference to 'av_stereo3d_alloc'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(nut.o):nut.c:function ff_nut_add_sp: error: undefined reference to 'av_tree_node_alloc'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(nut.o):nut.c:function ff_nut_add_sp: error: undefined reference to 'av_tree_insert'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(nut.o):nut.c:function ff_nut_free_sp: error: undefined reference to 'av_tree_enumerate'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(nut.o):nut.c:function ff_nut_free_sp: error: undefined reference to 'av_tree_destroy'
    
Error:error: ld returned 1 exit status
    
Error:Execution failed for task ':app:linkHello-jniArmeabi-v7aDebugSharedLibrary'.
    
> A build operation failed.
    
      Linker failed while linking libhello-jni.so.
    
  See the complete log at: file:///Users/marcos/Documents/Android/fdecoder/app/build/tmp/linkHello-jniArmeabi-v7aDebugSharedLibrary/output.txt
    
Information:BUILD FAILED
    
Information:Total time: 14.993 secs
    
Information:2 errors
    
Information:0 warnings
    
Information:See complete output in console

    There’s obviously something I’m not importing properly, but can’t figure exactly what’s missing.

  • Using FFMPEG in a Visual Studio 2013 ultimate project, linking error LNK2019

    27 mars 2015, par Jokke Ruokolainen

    I’m trying to use FFmpeg library and TIFF lib in my project (I’m making a .dll and/or .exe also). I have searched through the answers provided in here and Google, and linked the /dev/include 64-bit (32-bit VS making 64-bit project) to Additional Include Directories and shared/bin (library files) 64-bit to linker->Additional Library Directories and did the Linker->Additional Depedencies->avformat.lib addition. I also copied the .dll files to my project folder, but I still keep getting the LNK2019. Here’s how I use the libs and the output of the compiler :

    extern "C" {
    

    
#ifndef inline
    
#define inline __inline
    
#endif
    
#ifndef UINT64_C
    
#define UINT64_C uint64_t
    
#define INT64_C int64_t
    
#endif
    

    
#include 
    
#include 
    
#include 
    

    
}
    
#pragma comment(lib, "avformat.lib")
    

    
1>------ Build started: Project: GHSOM_V3, Configuration: FFmpeg x64 ------
    
1>  ffmpeg_io.cpp
    
1>ffmpeg_io.obj : error LNK2019: unresolved external symbol av_malloc referenced in function "struct AVFrame * __cdecl alloc_picture(enum AVPixelFormat,int,int)" (?alloc_picture@@YAPEAUAVFrame@@W4AVPixelFormat@@HH@Z)
    
1>ffmpeg_io.obj : error LNK2019: unresolved external symbol av_free referenced in function "struct AVFrame * __cdecl alloc_picture(enum AVPixelFormat,int,int)" (?alloc_picture@@YAPEAUAVFrame@@W4AVPixelFormat@@HH@Z)
    
1>ffmpeg_io.obj : error LNK2019: unresolved external symbol av_freep referenced in function "void __cdecl aviCloseWriter(struct tagAVIWriter *)" (?aviCloseWriter@@YAXPEAUtagAVIWriter@@@Z)
    
1>ffmpeg_io.obj : error LNK2019: unresolved external symbol av_rescale_q referenced in function "void __cdecl aviWriteFrame(struct tagAVIWriter *,unsigned char *)" (?aviWriteFrame@@YAXPEAUtagAVIWriter@@PEAE@Z)
    
1>ffmpeg_io.obj : error LNK2019: unresolved external symbol av_frame_alloc referenced in function "struct AVFrame * __cdecl alloc_picture(enum AVPixelFormat,int,int)" (?alloc_picture@@YAPEAUAVFrame@@W4AVPixelFormat@@HH@Z)
    
1>ffmpeg_io.obj : error LNK2019: unresolved external symbol avcodec_open2 referenced in function "void __cdecl initiate_avi_create(struct tagAVIWriter *,int,int)" (?initiate_avi_create@@YAXPEAUtagAVIWriter@@HH@Z)
    
1>ffmpeg_io.obj : error LNK2019: unresolved external symbol avcodec_close referenced in function "void __cdecl aviCloseReader(struct tagAVIReader *)" (?aviCloseReader@@YAXPEAUtagAVIReader@@@Z)
    
1>ffmpeg_io.obj : error LNK2019: unresolved external symbol av_init_packet referenced in function "void __cdecl aviWriteFrame(struct tagAVIWriter *,unsigned char *)" (?aviWriteFrame@@YAXPEAUtagAVIWriter@@PEAE@Z)
    
1>ffmpeg_io.obj : error LNK2019: unresolved external symbol av_free_packet referenced in function "void __cdecl aviReadFrame(struct tagAVIReader *,unsigned char *,int)" (?aviReadFrame@@YAXPEAUtagAVIReader@@PEAEH@Z)
    
1>ffmpeg_io.obj : error LNK2019: unresolved external symbol avcodec_find_decoder referenced in function "void __cdecl initiate_avi_open(struct tagAVIReader *)" (?initiate_avi_open@@YAXPEAUtagAVIReader@@@Z)
    
1>ffmpeg_io.obj : error LNK2019: unresolved external symbol avcodec_decode_video2 referenced in function "void __cdecl aviReadFrame(struct tagAVIReader *,unsigned char *,int)" (?aviReadFrame@@YAXPEAUtagAVIReader@@PEAEH@Z)
    
1>ffmpeg_io.obj : error LNK2019: unresolved external symbol avcodec_find_encoder referenced in function "void __cdecl initiate_avi_create(struct tagAVIWriter *,int,int)" (?initiate_avi_create@@YAXPEAUtagAVIWriter@@HH@Z)
    
1>ffmpeg_io.obj : error LNK2019: unresolved external symbol avcodec_find_encoder_by_name referenced in function "void __cdecl initiate_avi_create(struct tagAVIWriter *,int,int)" (?initiate_avi_create@@YAXPEAUtagAVIWriter@@HH@Z)
    
1>ffmpeg_io.obj : error LNK2019: unresolved external symbol avcodec_encode_video referenced in function "void __cdecl aviWriteFrame(struct tagAVIWriter *,unsigned char *)" (?aviWriteFrame@@YAXPEAUtagAVIWriter@@PEAE@Z)
    
1>ffmpeg_io.obj : error LNK2019: unresolved external symbol avpicture_fill referenced in function "struct AVFrame * __cdecl alloc_picture(enum AVPixelFormat,int,int)" (?alloc_picture@@YAPEAUAVFrame@@W4AVPixelFormat@@HH@Z)
    
1>ffmpeg_io.obj : error LNK2019: unresolved external symbol avpicture_get_size referenced in function "struct AVFrame * __cdecl alloc_picture(enum AVPixelFormat,int,int)" (?alloc_picture@@YAPEAUAVFrame@@W4AVPixelFormat@@HH@Z)
    
1>ffmpeg_io.obj : error LNK2019: unresolved external symbol sws_getContext referenced in function "void __cdecl initiate_avi_create(struct tagAVIWriter *,int,int)" (?initiate_avi_create@@YAXPEAUtagAVIWriter@@HH@Z)
    
1>ffmpeg_io.obj : error LNK2019: unresolved external symbol sws_scale referenced in function "void __cdecl aviReadFrame(struct tagAVIReader *,unsigned char *,int)" (?aviReadFrame@@YAXPEAUtagAVIReader@@PEAEH@Z)
    
1>tiff_io.obj : error LNK2019: unresolved external symbol TIFFClose referenced in function "void __cdecl tiffReadRGBA(char *,int *,int *,unsigned char *)" (?tiffReadRGBA@@YAXPEADPEAH1PEAE@Z)
    
1>tiff_io.obj : error LNK2019: unresolved external symbol TIFFGetField referenced in function "void __cdecl tiffReadRGBA(char *,int *,int *,unsigned char *)" (?tiffReadRGBA@@YAXPEADPEAH1PEAE@Z)
    
1>tiff_io.obj : error LNK2019: unresolved external symbol TIFFSetField referenced in function "void __cdecl tiffWriteRGBA(char *,int,int,unsigned char *)" (?tiffWriteRGBA@@YAXPEADHHPEAE@Z)
    
1>tiff_io.obj : error LNK2019: unresolved external symbol TIFFReadRGBAImage referenced in function "void __cdecl tiffReadRGBA(char *,int *,int *,unsigned char *)" (?tiffReadRGBA@@YAXPEADPEAH1PEAE@Z)
    
1>tiff_io.obj : error LNK2019: unresolved external symbol TIFFOpen referenced in function "void __cdecl tiffReadRGBA(char *,int *,int *,unsigned char *)" (?tiffReadRGBA@@YAXPEADPEAH1PEAE@Z)
    
1>tiff_io.obj : error LNK2019: unresolved external symbol TIFFWriteEncodedStrip referenced in function "void __cdecl tiffWriteRGBA(char *,int,int,unsigned char *)" (?tiffWriteRGBA@@YAXPEADHHPEAE@Z)
    
1>Video.obj : error LNK2019: unresolved external symbol "void __cdecl DCT2d(double *,double *,long,long)" (?DCT2d@@YAXPEAN0JJ@Z) referenced in function "void __cdecl ForwardDCT(class DataShuffle *,unsigned char *,char *,int,int,int,int,int,bool)" (?ForwardDCT@@YAXPEAVDataShuffle@@PEAEPEADHHHHH_N@Z)
    
1>Video.obj : error LNK2019: unresolved external symbol "void __cdecl IDCT2d(double *,double *,long,long)" (?IDCT2d@@YAXPEAN0JJ@Z) referenced in function "void __cdecl ExportVideoFromDCT(class DataShuffle *,char *,char *,int,int,int,int)" (?ExportVideoFromDCT@@YAXPEAVDataShuffle@@PEAD1HHHH@Z)
    
1>Video.obj : error LNK2019: unresolved external symbol "void __cdecl CopyToZigZag(double *,double *,long,long,long)" (?CopyToZigZag@@YAXPEAN0JJJ@Z) referenced in function "void __cdecl ForwardDCT(class DataShuffle *,unsigned char *,char *,int,int,int,int,int,bool)" (?ForwardDCT@@YAXPEAVDataShuffle@@PEAEPEADHHHHH_N@Z)
    
1>Video.obj : error LNK2019: unresolved external symbol "void __cdecl CopyFromZigZag(double *,double *,long,long,long)" (?CopyFromZigZag@@YAXPEAN0JJJ@Z) referenced in function "void __cdecl ExportVideoFromDCT(class DataShuffle *,char *,char *,int,int,int,int)" (?ExportVideoFromDCT@@YAXPEAVDataShuffle@@PEAD1HHHH@Z)

  • A C language ffmpeg project organized with CMakeLists, encounters errors in the Windows MinGW64 environment

    20 juin 2023, par flywen

    Project Structure

    


    ffmpeg-tutorial

    


      

    • include

        

      • libavcodec

        • 


      • libavdevice

        • 


      • libavfilter

        • 


      • libavformat

        • 


      • libavutil

        • 


      • libswresample

        • 


      • libswscale

        • 


      


      • 


    • lib

        

      • pkgconfig

        • 


      • libavcodec.a

        • 


      • libavdevice.a

        • 


      • libavfilter.a

        • 


      • libformat.a

        • 


      • libavutil.a

        • 


      • libswresample.a

        • 


      • libswscale.a

        • 


      


      • 


    • CMakeLists.txt

      • 


    • main.c

      • 


    


    CMakeLists.txt

    


    cmake_minimum_required(VERSION 3.20)
project(ffmpeg_tutorial)

set(CMAKE_C_STANDARD 11)

include_directories(include)
link_directories(lib)
add_executable(ffmpeg_tutorial main.cpp)
target_link_libraries(ffmpeg_tutorial
        avformat
        avcodec
        avutil
        swscale
        swresample
        z
        bz2
        iconv
        ws2_32
        schannel
        kernel32
        advapi32
        kernel32
        user32
        gdi32
        winspool
        shell32
        ole32
        oleaut32
        uuid
        comdlg32
        advapi32
        )


    


    main.c

    


    #include 
#include "libavcodec/avcodec.h"
#include "libavformat/avformat.h"
#include "libswresample/swresample.h"
int main() {
    std::cout << "Hello, World!" << std::endl;
    std::cout << av_version_info() << std::endl;
    printf("ffmpeg version is %s\n", av_version_info());
    // Open input file
    AVFormatContext *inputContext = nullptr;
    if (avformat_open_input(&inputContext, "input.mp3", nullptr, nullptr) != 0) {
        printf("Couldn't open input file\n");
        return -1;
    }

    // Read input stream
    if (avformat_find_stream_info(inputContext, nullptr) < 0) {
        printf("Couldn't find stream information\n");
        return -1;
    }

    // Get audio stream index
    int audioStream = -1;
    for (int i = 0; i < inputContext->nb_streams; i++) {
        if (inputContext->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
            audioStream = i;
            break;
        }
    }

    if (audioStream == -1) {
        printf("Couldn't find audio stream\n");
        return -1;
    }
}



    


    IDE

    


    clion

    


    ERRORS

    


    [ 50%] Building CXX object CMakeFiles/ffmpeg_tutorial.dir/main.cpp.obj
[100%] Linking CXX executable ffmpeg_tutorial.exe
D:/Msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe: G:/cywen_private/cpp_projects/ffmpeg-tutorial/lib/libavformat.a(tls_schannel.o): in function `tls_write':
D:\Msys64\usr\src\ffmpeg/libavformat/tls_schannel.c:563: undefined reference to `EncryptMessage'
D:/Msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe: G:/cywen_private/cpp_projects/ffmpeg-tutorial/lib/libavformat.a(tls_schannel.o): in function `tls_read':
D:\Msys64\usr\src\ffmpeg/libavformat/tls_schannel.c:441: undefined reference to `DecryptMessage'
D:/Msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe: G:/cywen_private/cpp_projects/ffmpeg-tutorial/lib/libavcodec.a(mfenc.o):mfenc.c:(.rdata$.refptr.IID_ICodecAPI[.refptr.IID_ICodecAPI]+0x0): undefined reference to `IID_ICodecAPI'
D:/Msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe: G:/cywen_private/cpp_projects/ffmpeg-tutorial/lib/libavcodec.a(tiff.o): in function `tiff_uncompress_lzma':
D:\Msys64\usr\src\ffmpeg/libavcodec/tiff.c:577: undefined reference to `lzma_stream_decoder'
D:/Msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe: D:\Msys64\usr\src\ffmpeg/libavcodec/tiff.c:582: undefined reference to `lzma_code'
D:/Msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe: D:\Msys64\usr\src\ffmpeg/libavcodec/tiff.c:583: undefined reference to `lzma_end'
D:/Msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe: G:/cywen_private/cpp_projects/ffmpeg-tutorial/lib/libavutil.a(random_seed.o): in function `av_get_random_seed':
D:\Msys64\usr\src\ffmpeg/libavutil/random_seed.c:127: undefined reference to `BCryptOpenAlgorithmProvider'
D:/Msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe: D:\Msys64\usr\src\ffmpeg/libavutil/random_seed.c:130: undefined reference to `BCryptGenRandom'
D:/Msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe: D:\Msys64\usr\src\ffmpeg/libavutil/random_seed.c:131: undefined reference to `BCryptCloseAlgorithmProvider'
collect2.exe: error: ld returned 1 exit status
mingw32-make[3]: *** [CMakeFiles\ffmpeg_tutorial.dir\build.make:95: ffmpeg_tutorial.exe] Error 1
mingw32-make[2]: *** [CMakeFiles\Makefile2:82: CMakeFiles/ffmpeg_tutorial.dir/all] Error 2
mingw32-make[1]: *** [CMakeFiles\Makefile2:89: CMakeFiles/ffmpeg_tutorial.dir/rule] Error 2
mingw32-make: *** [Makefile:123: ffmpeg_tutorial] Error 2


    


    What is the way I compile ffmpeg

    


      


    • downlaod msys2

      


      • 


    • install mingw64

      


      • 


    


    pacman -S mingw-w64-x86_64-toolchain


    


      


    • install make,diffutils,nasm,yasm,pkg-config

      


      • 


    


    pacman -S base-devl yasm nasm pkg-config


    


      


    • download ffmpeg 5.1

      


      • 


    • compile

      


      • 


    


    cd ffmpeg
./configure --disable-shared --enable-static --arch=x86_64 --target-os=mingw32 --cross-prefix=x86_64-w64-mingw32- --pkg-config-flags=--static --prefix=../ffmpeg-build

make -j $(nproc)

make install



    


    Project Repoistory

    


    https://github.com/joinwen/learn_ffmpeg.git

    


    Expectation

    


      

    1. How to solve errors

      2. 


    2. In CMakeLists target_link_libraries's parameters is too much, Can I make it short

      3. 


    3. some advices on the project

      4. 


    


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